Answer:
Metaphase
Metaphase. During metaphase, spindle fibers attach to the centromere of each pair of sister chromatids (see Figure below). The sister chromatids line up at the equator, or center, of the cell. This is also known as the metaphase plate.
Explanation:
Image result for What will happen if air sacs are damaged?
When emphysema develops, the alveoli and lung tissue are destroyed. With this damage, the alveoli cannot support the bronchial tubes. The tubes collapse and cause an “obstruction” (a blockage), which traps air inside the lungs. Too much air trapped in the lungs can give some patients a barrel-chested appearance.
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Answer:
B. Varying exercise types helps to improve the likelihood of maintaining a program successfully
Explanation:
A. Progress is always steady = this is false, progress can occur at different rates at different times, depending on the activity, strengths, and fitness levels
B. Varying exercise types helps to improve the likelihood of maintaining a program successfully - this is true - keeping a training programme fresh and having lots of variety in the exercise types helps to reduce boredom
C. Exercising with a partner can be fun, but does not improve the likelihood of maintaining a fitness program - false, exercising with a partner can help both individuals be more motivated, keeps them accountable, and could be more fun.
D. Starting off an exercise program at a high level of intensity is advisable to improve the chances of success - this is false. this could cause injury and demotivation
